What is the [H+] of a solution with a pH of 5.6?
What is the concentration of hydrogen ions, [H+], in a solution with a pH of 5.6? Please use a scientific calculator to determine your answer. (Points: 3)
a) 5.0 × 10⁵
b) 8.3 × 10⁶
c) 2.5 × 10⁶
d) 7.7 × 10⁵
Which of the following [H+] values corresponds to the most basic (alkaline) solution? (Points: 3)
a) 10¹ M
b) 10⁷ M
c) 10¹² M
d) 10¹⁴ M
Lemon juice is a weak acid with a [H+] concentration of 5.0 × 10² M. What is the pH of lemon juice? Please use a scientific calculator to find your answer. (Points: 3)
a) 1.0
b) 1.3
c) 2.0
d) 2.5
Pyridine, a weak base with the formula C₅H₅N, reacts with water according to the following equation:
C₅H₅N + H₂O ⇌ C₅H₅NH⁺ + OH⁻.
What is the formula for the dissociation constant (Kb) of this base? (Points: 3)
a) Kb = [H⁺][C₅H₅NH⁺]/[C₅H₅N]
b) Kb = [C₅H₅N]/[OH⁻][C₅H₅NH⁺]
c) Kb = [C₅H₅N][OH⁻]/[C₅H₅NH⁺]
d) Kb = [OH⁻][C₅H₅NH⁺]/[C₅H₅N]
1 Answers
Feb 02, 2025
H+]= 10^-5.6 =2.5 x 10^-6 M
10^-14 M
pH = - log 5.0 x 10^-2 =1.3
Kb = [OH-][C5H5NH+] / [C5H5N]
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